Given: 5x + 11 + 8x = 128
Prove: x = 9

Step-by-step explanation:

5 + 11 + 8

5x+11+8

5x+11+8

Simplify

1

Add the numbers

5 + 11 + 8

5x+{\color{#c92786}{11}}+{\color{#c92786}{8}}

5x+11+8

5 + 19

5x+{\color{#c92786}{19}}

5x+19

Solution

5 + 19

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)